package com.study.smallchange.oop;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class SmallChangeSysOOP {
    boolean loop = true;
    Scanner sc = new Scanner(System.in);
    String key = "";

    // 零钱通明细
    String details = "--------零钱通明细-------";

    // 完成收益入账
    double money = 0;
    double balance = 0;
    Date date = null;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    // 消费
    String note = "";

    public void mainMenu() {
        do {
            System.out.println("======零钱通菜单======");
            System.out.println("\t1 零钱通明细");
            System.out.println("\t2 收益入账");
            System.out.println("\t3 消费");
            System.out.println("\t4 退出");

            System.out.println("请选择1~4: ");
            key = sc.next();

            // 分支控制
            switch (key) {
                case "1":
                    this.detail();
                    break;
                case "2":
                    this.income();
                    break;
                case "3":
                    this.pay();
                    break;
                case "4":
                    this.exit();
                    break;
                default:
                    System.out.println("选择有误, 请重新选择");
            }
        } while (loop);
    }

    public void detail() {
        System.out.println(details);
    }

    public void income() {
        System.out.println("收益入账:");
        money = sc.nextDouble();
        // 校验 money
        if (money <= 0) {
            System.out.println("入账不能为负数");
            return;
        }
        balance += money;
        date = new Date();
        details += "\n收益入账\t+" + money + "\t" + sdf.format(date) + "\t" + balance;
    }

    public void pay() {
        System.out.println("消费金额:");
        money = sc.nextDouble();
        if (money <= 0 || money > balance) {
            System.out.println("消费金额应在0-" + balance + "之间");
            return;
        }
        System.out.println("消费说明:");
        note = sc.next();
        balance -= money;
        date = new Date();
        details += "\n" + note + "\t-" + money + "\t" + sdf.format(date) + "\t" + balance;
    }

    public void exit() {
        String choice = "";
        while (true) {
            System.out.println("你确定要退出吗? y/n");
            choice = sc.next();
            if (choice.equalsIgnoreCase("y") || choice.equalsIgnoreCase("n")) {
                break;
            }
        }

        if (choice.equalsIgnoreCase("y")) {
            loop = false;
        }
    }
}
